Questionnaires and web tests allow doctors to reach a far wider market than classic paper forms, telephone or face-to-face interviews and is conducted for a cheaper cost. This will make them a common tool designed for market research and customer studies as well as internal research. However , inspite of their many advantages offered with some drawbacks which can undermine the quality of the outcomes.
One serious problem is that generally there is much less control over capture data than with a paper customer survey. With a Internet experiment the participant will be able to view stimuli on their own personal device and may also improve settings including screen size, browser, internet connection and the standard font. It indicates that every respondent experience a discreetly different set of questions and this can impact how they answer questions.
Another read more problem is set of questions taking exhaustion which can lead to respondents leaving the survey. The way to prevent this is to help make the questionnaire while short as it can be and only inquire abuout that are highly relevant to your research. Also you can try to randomize the purchase of the questions and pretest the questionnaire before performing that to ensure that all the questions are obvious and understandable.
Finally, you will need to keep in mind that Web experiments are based on voluntary involvement so they can be susceptible to mindset confounding than laboratory trials. To counter this kind of, you can use an online marketplace including SONA devices (often used for undergraduate assessment at universities), MTurk or Productive to generate prospects participants.